“Eight people were arrested Sunday night in Huntington Beach, California after a rash of mob violence following the conclusion of a surfing competition, KABC-TV reported. (archived link)Local police told KABC the unrest began around 7:15 p.m. local time, about two hours after the end of the annual U.S. Open of Surfing event, when large fights broke out among the crowd of spectators, with the disturbances moving into the city’s downtown area as police moved in to disperse the revelers. Departments from nearby cities were called in for assistance, forcing streets to be closed down until the crowd was cleared out around 10 p.m.”
http://www.rawstory.com/rs/2013/07/29/8-arrested-as-surfing-crowd-trashes-porta-potties-after-event/